# ----------------------------------------------------------------------------
# pyglet
# Copyright (c) 2006-2008 Alex Holkner
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# * Neither the name of pyglet nor the names of its
# contributors may be used to endorse or promote products
# derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ----------------------------------------------------------------------------
'''
'''
__docformat__ = 'restructuredtext'
__version__ = '$Id: lib_glx.py 597 2007-02-03 16:13:07Z Alex.Holkner $'
import ctypes
from ctypes import *
import pyglet
from pyglet.gl.lib import missing_function,decorate_function
__all__ = ['link_GL', 'link_GLU', 'link_WGL']
_debug_trace = pyglet.options['debug_trace']
gl_lib = ctypes.windll.opengl32
glu_lib = ctypes.windll.glu32
wgl_lib = gl_lib
if _debug_trace:
from pyglet.lib import _TraceLibrary
gl_lib = _TraceLibrary(gl_lib)
glu_lib = _TraceLibrary(glu_lib)
wgl_lib = _TraceLibrary(wgl_lib)
try:
wglGetProcAddress = wgl_lib.wglGetProcAddress
wglGetProcAddress.restype = CFUNCTYPE(POINTER(c_int))
wglGetProcAddress.argtypes = [c_char_p]
_have_get_proc_address = True
except AttributeError:
_have_get_proc_address = False
class WGLFunctionProxy(object):
__slots__ = ['name', 'requires', 'suggestions', 'ftype', 'func']
def __init__(self, name, ftype, requires, suggestions):
assert _have_get_proc_address
self.name = name
self.ftype = ftype
self.requires = requires
self.suggestions = suggestions
self.func = None
def __call__(self, *args, **kwargs):
if self.func:
return self.func(*args, **kwargs)
from pyglet.gl import current_context
if not current_context:
raise Exception(
'Call to function "%s" before GL context created' % self.name)
address = wglGetProcAddress(self.name)
if cast(address, POINTER(c_int)): # check cast because address is func
self.func = cast(address, self.ftype)
decorate_function(self.func, self.name)
else:
self.func = missing_function(
self.name, self.requires, self.suggestions)
result = self.func(*args, **kwargs)
return result
def link_GL(name, restype, argtypes, requires=None, suggestions=None):
try:
func = getattr(gl_lib, name)
func.restype = restype
func.argtypes = argtypes
decorate_function(func, name)
return func
except AttributeError, e:
# Not in opengl32.dll. Try and get a pointer from WGL.
try:
fargs = (restype,) + tuple(argtypes)
ftype = ctypes.WINFUNCTYPE(*fargs)
if _have_get_proc_address:
from pyglet.gl import gl_info
if gl_info.have_context():
address = wglGetProcAddress(name)
if address:
func = cast(address, ftype)
decorate_function(func, name)
return func
else:
# Insert proxy until we have a context
return WGLFunctionProxy(name, ftype, requires, suggestions)
except:
pass
return missing_function(name, requires, suggestions)
def link_GLU(name, restype, argtypes, requires=None, suggestions=None):
try:
func = getattr(glu_lib, name)
func.restype = restype
func.argtypes = argtypes
decorate_function(func, name)
return func
except AttributeError, e:
# Not in glu32.dll. Try and get a pointer from WGL.
try:
fargs = (restype,) + tuple(argtypes)
ftype = ctypes.WINFUNCTYPE(*fargs)
if _have_get_proc_address:
from pyglet.gl import gl_info
if gl_info.have_context():
address = wglGetProcAddress(name)
if address:
func = cast(address, ftype)
decorate_function(func, name)
return func
else:
# Insert proxy until we have a context
return WGLFunctionProxy(name, ftype, requires, suggestions)
except:
pass
return missing_function(name, requires, suggestions)
link_WGL = link_GL
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